Abstract: Bis­[-di-tert-butyl­(hy­droxy)­silanol­ato]­bis­[chlorido­indium(III)], [In2(C8H19O2Si)2Cl4], (I), is a centrosymmetric two-centre indium complex featuring a system of three annulated four-membered rings; the structure is the first example of an In2O2 ring which is annulated with two Si-O units to form a ring system composed of three rings. The coordination environment of the In centres is a distorted trigonal bipyramid. The crystal packing of (I) is characterized by chains of mol­ecules connected by O-HCl hydrogen bonds. The crystal of (I) was a nonmerohedral twin. There is no known example of an In2O2 ring in which the In atoms carry any two halogen ligands. The structure of tetra­kis­(tetra­hydro­furan)­lithium tetra­kis­[(tri­methyl­silyl)­methyl]­borate, [Li(C4H8O)4](C16H44BSi4), (II), is composed of discrete cations and anions. The coordination geometries of the Li and B centres is tetra­hedral. The cations and anions lie in planes parallel to the ab plane. There are no short contacts between the cations and anions. Compound (II) is the first example of a B centre bonded to four -CH2Si units.

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